# Convert the number from Indian system to International system

• Last Updated : 04 Jun, 2020

Given an input string N consisting of numerals and separators (, ) in the Indian Numeric System, the task is to print the string after placing separators(, ) based on International Numeric System.

Examples:

Input: N = “12, 34, 56, 789”
Output: 123, 456, 789

Input: N = “90, 05, 00, 00, 000”
Output: 90, 050, 000, 000

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach:

1. Remove all the separators (, ) from the string.
2. Iterate from the end of the string and place a separator(, ) after every third number.
3. Print the result.

Below is the implementation of the above approach:

## C++

 `// C++ Program to convert``// the number from Indian system``// to International system`` ` `#include ``using` `namespace` `std;`` ` `// Function to convert Indian Numeric``// System to International Numeric System``string convert(string input)``{``    ``// Length of the input string``    ``int` `len = input.length();`` ` `    ``// Removing all the separators(, )``    ``// From the input string``    ``for` `(``int` `i = 0; i < len; i++) {``        ``if` `(input[i] == ``','``) {``            ``input.erase(input.begin() + i);``            ``len--;``            ``i--;``        ``}``    ``}`` ` `    ``// Initialize output string``    ``string output = ``""``;``    ``int` `ctr = 0;`` ` `    ``// Process the input string``    ``for` `(``int` `i = len - 1; i >= 0; i--) {`` ` `        ``ctr++;``        ``output = input[i] + output;`` ` `        ``// Add a separator(, ) after``        ``// every third digit``        ``if` `(ctr % 3 == 0 && ctr < len) {``            ``output = ``','` `+ output;``        ``}``    ``}`` ` `    ``// Return the output string back``    ``// to the main function``    ``return` `output;``}`` ` `// Driver Code``int` `main()``{``    ``string input1 = ``"12,34,56,789"``;``    ``string input2 = ``"90,05,00,00,000"``;`` ` `    ``cout << convert(input1) << endl;``    ``cout << convert(input2) << endl;``}`
Output:
```123,456,789
90,050,000,000
```

Related article: Convert the number from International system to Indian system

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